Old PAYG to Galaxy S6

[AC Question]

Existing Sim is for old Samsung GT E1170 and requires top up as funding depletes.
Am interested in cash purchase of Galaxy S6 32 GB Sim Free.
1: If bought outright, are there charges for everyday use.
2: will the existing (PAYG) Sim work in the new Galaxy?
3: would it be better to buy replacement Sim with new Galaxy S6?

 

[anon(632115)]

Mobile data can quickly eat up credit so you will need to keep an eye on that. Your old simply won't fit the S6